Make private desktop tools opt-in and preserve host defaults

source/expanded/framebridge_expanded/guide_data.py

@@ -302,7 +302,7 @@ GUIDE = {'start': {'title': 'Start with FrameBridge',
                                    'partial invented view as a real screenshot.',
                            'commands': []},
                           {'heading': 'Automatic graphical discovery',
-                           'body': 'The installer and control console stay text interfaces in both TTY and a desktop terminal. Compatible graphical CUA is discovered automatically; availability depends on the actual display/session and permissions. A loaded module is not proof that real pixel capture or input succeeded. New profiles use adaptive auto mode: without a verified active X11 session the runtime provides FBEXEC, FBTERM and CUA-TTY in text mode, without requiring a graphical login or automatically creating a private desktop. Explicit virtual-desktop settings remain advanced options and are labelled separately from physical-screen evidence. Physical-screen capture and input currently require the supported active X11 session. Native Wayland control is not validated; showing an XWayland window does not establish full-desktop capture or input.',
+                           'body': 'The installer and control console stay text interfaces in both TTY and a desktop terminal. Compatible graphical CUA is discovered automatically; availability depends on the actual display/session and permissions. A loaded module is not proof that real pixel capture or input succeeded. New profiles use adaptive auto mode: without a verified active X11 session the runtime provides FBEXEC, FBTERM and CUA-TTY in text mode, without requiring a graphical login or automatically creating a private desktop. Explicit virtual-desktop settings remain advanced options and are labelled separately from physical-screen evidence. Xvfb and Openbox are optional package suggestions and are not installed for the normal connection. Only when you choose a private virtual desktop, install its tools explicitly with sudo apt install xvfb openbox xauth and rerun fb doctor. Installing Openbox can register it as the generic window-manager alternative; use your distribution settings to retain your preferred manager when needed. Physical-screen capture and input currently require the supported active X11 session. Native Wayland control is not validated; showing an XWayland window does not establish full-desktop capture or input.',
                            'commands': ['fb status', 'fb doctor']},
                           {'heading': 'Frame-buffer read access',
                            'body': 'screen-access is a narrow, explicit administrative permission '